I think gambling has little to do with wealth, I mean, both poor and rich people gamble, win, loose.
The difference is that rich people don't care about loosing as much as poor people do.
If you are rich you just don't know what to do with all that money, so you play; I think I would do the same.
People who are poor are having problem as they gamble because they don't know where to get money in able to sustain their gamble acts.
But for those rich people, they have problem also. They are thinking in what things where they could spend their money.
And that is very easy thing for rich people to gamble any amount they afford to lose because they have unlimited source of capital.
So if a poor gambler because lucky and he becomes rich then he will keep on doing it.
Honestly I like the problem of the rich base on your example, problem on how to spend your money than problem on where to get money is more appealing, I wish I was rich, does not matter if I have that problem on how to spend money, it can easily be figured out.